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Proceedings Paper

Flash imaging in dual source CT (DSCT)
Author(s): H. Bruder; M. Petersilka; H. Mehldau; W. Heidinger; T. Allmendinger; B, Schmidt; R. Raupach; C, Thierfelder; K. Stierstorfer; T. Flohr
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Paper Abstract

We present new acquisition modes of a recently introduced dual-source computed tomography (DSCT) system equipped with two X-ray tubes and two corresponding detectors, mounted onto the rotating gantry with an angular offset of typically 90°. Due to the simultaneous acquisition of complementary data, the minimum exposure time is reduced by a factor of two compared to a single-source CT system (SSCT). The correspondingly improved temporal resolution is beneficial for cardiac CT. Also, maximum table feed per rotation in a spiral mode can be increased by a factor of 2 compared to SSCT, which provides benefits both for cardiac CT and non-cardiac CT. In an ECG-triggered mode the entire cardiac volume can be scanned within a fraction of one cardiac RR-cycle. At a rotation time of 0.28s using a detector with 64×0.6 mm beam collimation, the scan time of the entire heart is less than 0.3s at a temporal resolution of 75 ms. It will be shown, that the extremely fast cardiac scan reduces the patient dose to a theoretical lowest limit: for a 120 kV scan the dose level for a typical cardiac CT scan is well below 2 mSv. Using further protocol optimization (scan range adaptation, 100kV), the radiation dose can be reduced below 1mSv.

Paper Details

Date Published: 10 March 2009
PDF: 11 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72580D (10 March 2009); doi: 10.1117/12.811119
Show Author Affiliations
H. Bruder, Siemens Healthcare (Germany)
M. Petersilka, Siemens Healthcare (Germany)
H. Mehldau, Siemens Healthcare (Germany)
W. Heidinger, Siemens Healthcare (Germany)
T. Allmendinger, Siemens Healthcare (Germany)
B, Schmidt, Siemens Healthcare (Germany)
R. Raupach, Siemens Healthcare (Germany)
C, Thierfelder, Siemens Healthcare (Germany)
K. Stierstorfer, Siemens Healthcare (Germany)
T. Flohr, Siemens Healthcare (Germany)

Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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